Improve shop registration form

[KilianZimmerer]

• More opening hours possibilities
• '(optional)' tag in the optional fields and '*' to the mandatory fields
• Extra field for street no.
• make it easier for mobile users (maybe put the form on a new page?)
• ...

[KilianZimmerer]

optional tag are included, also asterix' for required fields. Also there is a maximum length for input to avoid mysql query errors